Volume 5 Issue 5, May 2011

Volume 5 Issue 5

Researchers have shown how coupling a nitrogen–vacancy centre to the whispering gallery mode of an optical resonator fabricated in single-crystal diamond can enhance single-photon emission.

Image courtesy of A. Faraon et. al.

Letter by Faraon et. al.

Editorials

Application Note

Correspondence

Research Highlights

News and Views

Business News

Profile

  • Profile |

    Oxford Photovoltaics is the newest contender in the race to commercialize dye-sensitized solar cells. Nadya Anscombe finds out what makes this company think it can succeed.

    • Nadya Anscombe

Industry Perspectives

  • Industry Perspective |

    Scaling IT infrastructure from microscale processors to macroscale data centres and telecommunications networks requires high-bandwidth technologies that are cheap, low-power and small. Silicon photonics that utilizes scalable CMOS technology may offer a highly integrated photonics transmission platform for such applications.

    • Mehdi Asghari
    •  & Ashok V. Krishnamoorthy
  • Industry Perspective |

    A growing body of medical evidence suggests that disrupting the body's biological clock can have adverse effects on health. Researchers are now creating the photonic tools to monitor, predict and influence the circadian rhythm.

    • Mark S. Rea

Review

Product Highlights

Interviews

  • Interview |

    Nadya Anscombe talks to Stephen Eglash of the Precourt Institute for Energy at Stanford University in the USA about his vision for the green photonics sector.

  • Interview |

    Andrei Faraon from Hewlett-Packard describes how he and his colleagues achieved an eightfold enhancement to the zero-phonon emission from single nitrogen–vacancy centres in diamond.

Letters

  • Letter |

    Researchers cancel out the Dick effect through a synchronous frequency comparison between two optical lattice clocks based on 87Sr and 88Sr atoms. This scheme achieves an Allan standard deviation of around 10−17, which represents a significant advantage when using a large number (2,000) of atoms in an optical clock.

    • Masao Takamoto
    • , Tetsushi Takano
    •  & Hidetoshi Katori
  • Letter |

    By controlling the group velocity dispersion of a microresonator through proper shape design, scientists generate a comb whose central frequency can be tuned throughout the transparency window of the microresonator host material.

    • A. A. Savchenkov
    • , A. B. Matsko
    • , W. Liang
    • , V. S. Ilchenko
    • , D. Seidel
    •  & L. Maleki
  • Letter |

    Researchers demonstrate continuous-wave lasing from a quantum dot photonic crystal nanocavity at temperatures of up to 150 K. The achieved lasing thresholds of 181 nA (at 50 K) and 287 nA (at 150 K) are record-lows for any type of electrically pumped laser.

    • Bryan Ellis
    • , Marie A. Mayer
    • , Gary Shambat
    • , Tomas Sarmiento
    • , James Harris
    • , Eugene E. Haller
    •  & Jelena Vučković

Article

  • Article |

    Researchers demonstrate a terahertz quantum cascade laser operating in a regime of active mode-locking by modulating its bias current with a radiofrequency synthesizer. This technique allows coherent sampling of the terahertz electric field as well as control over the laser's carrier–envelope phase shift.

    • Stefano Barbieri
    • , Marco Ravaro
    • , Pierre Gellie
    • , Giorgio Santarelli
    • , Christophe Manquest
    • , Carlo Sirtori
    • , Suraj P. Khanna
    • , Edmund H. Linfield
    •  & A. Giles Davies

Focus

  • Focus |

    Green photonics

    Increasing pressure to reduce greenhouse gas emissions and become more environmentally friendly is creating a myriad of opportunities for photonic technologies.